The allergy medication Benadryl typically stays in the system for four to six hours. Most products instruct users to take the stated dosage every four to six hours as needed, while not exceeding six doses in a single day, per instructions on the package label.Know More
The antihistamine provides temporary relief from seasonal allergies, hay fever, allergic reactions and other upper respiratory allergies and is also effective in treating runny nose and itchy or watery eyes.
Benadryl is available in capsule, tablet and liquid form and as a topical analgesic.
Common side effects of the drug include sedation, tiredness, sleepiness, dizziness, disturbed coordination, drying and thickening of oral and other respiratory secretions and stomach distress, according to the medical experts at rxlist.com.Learn more about Medications & Vitamins
Adults and children 12 years and older can take one or two Benadryl Allergy 25 milligram tablets every four to six hours, states the manufacturer, McNeil-PPC. Children between the ages of 6 and 12 should only take one tablet. Children under the age of 6 should not use this medication.Full Answer >
Immediate release Ritalin, which contains the drug called methylphenidate, lasts for three to six hours, typically peaking at approximately two hours after dosing. According to the Family Practice Notebook, the length of time methylphenidate's effects last depend on the formulation in which it is delivered.Full Answer >
Tizanidine stays in the body between three to six hours, with its peak effect during the second and third hour, according to Drugs.com. Another dose can be taken six to eight hours later, but no more than three doses should be taken in one day.Full Answer >
HealthTap says it takes four to six hours for the effects of NyQuil to fade. Drugs.com says that NyQuil is intended to be taken every six hours as needed to treat cold symptoms.Full Answer >